The South Australian cobbler (Gymnapistes marmoratus), better known as the soldier but also known as the cobbler, devilfish or soldierfish, is a species of marine ray-finned fish, a waspfish, belonging to the subfamily Tetraroginae which is classified within the family Scorpaenidae, the scorpionfishes and their relatives.

The South Australian cobbler was first formally described in 1829 as Apistus marmoratus by the French zoologist Georges Cuvier with the type locality given as "Timor Island, southern Malay Archipelago", although this is likely to be an error and the actual locality is in Western Australia.

[1] The genus name is a compound of gymnos which means "bare" or "naked" with Apistes, this was originally proposed as a subgenus of Apistus and the first part alludes to the mostly scaleless body of this taxon.

[5] The South Australian cobbler has a long based dorsal fin which has 12 or 13 spines,[6] each separated by an incision in the membrane between them,[7] and between 7 and 10 soft rays, the spiny and soft-rayed parts are separated by an incision, with 3 spines and 4 to 6 soft rays in its anal fin.

Its distribution extends from the central coast of New South Wales to Perth, Western Australia.

It is found in shallow inshore waters, tidal pools and estuaries at depths between 0.25 and 35 m (9.8 in and 114 ft 10.0 in) in beds of seagrass.